package com.itheima.reggie.filter;


import com.alibaba.fastjson.JSON;
import com.itheima.reggie.common.BaseContext;
import com.itheima.reggie.common.R;
import lombok.extern.slf4j.Slf4j;
import org.springframework.util.AntPathMatcher;

import javax.servlet.*;
import javax.servlet.annotation.WebFilter;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.IOException;

/**
* @Description: 检查用户是否已经完成登录
        * @Param: 
        * @return: 
        * @Author: Lei
        * @Date: 
 */
@Slf4j
@WebFilter(filterName = "loginCheckFilter",urlPatterns = "/*")
public class LoginCheckFilter implements Filter {

    /**路径匹配器，支持通配符*/
    public static final AntPathMatcher PATH_MATCHER=new AntPathMatcher();

    @Override
    public void doFilter(ServletRequest servletRequest, ServletResponse servletResponse, FilterChain filterChain) throws IOException, ServletException {
        HttpServletRequest request= (HttpServletRequest) servletRequest;
        HttpServletResponse response= (HttpServletResponse) servletResponse;


        /**1.获取本次请求的URI*/
        String requestURI=request.getRequestURI();

        log.info("拦截到请求：{}",requestURI);

        /**定义不需要处理的请求路径*/
        String[] urls=new String[]{
                "/employee/login",
                "/employee/logout",
                "/backend/**",
                "/front/**",
                "/common/**",
                "/user/sendMsg",
                "/user/login",
                "/doc.html",
                "/webjars/**",
                "/swagger-resources",
                "/v2/api-docs"
        };
        /**2.判断本次请求是否需要处理*/
        boolean check=check(urls,requestURI);


        /**3.如果不需要处理，则直接放行*/
        if(check){
            log.info("本次请求{}不需要处理",requestURI);
            filterChain.doFilter(request,response);
            return;
        }
        /**4-1.判断员工登录状态，如果已经登录则放行*/
        if(request.getSession().getAttribute("employee")!=null){
            log.info("用户已登录，用户id为：{}",request.getSession().getAttribute("employee"));

            Long empId= (Long) request.getSession().getAttribute("employee");

            BaseContext.setCurrentId(empId);

//            long id=Thread.currentThread().getId();
//            log.info("线程id为:{}",id);

            filterChain.doFilter(request,response);
            return;
        }
        /**4-2.判断移动端顾客登录状态，如果已经登录则放行*/
        if(request.getSession().getAttribute("user")!=null){
            log.info("用户已登录，用户id为：{}",request.getSession().getAttribute("user"));

            Long userId= (Long) request.getSession().getAttribute("user");

            BaseContext.setCurrentId(userId);

            filterChain.doFilter(request,response);
            return;
        }

        log.info("用户未登录");
        /**5.如果未登录返回登录结果，通过输出流向客户端页面响应数据*/
        response.getWriter().write(JSON.toJSONString(R.error("NOTLOGIN")));
        return;
    }
    
    /**
    * @Description: 路径匹配，检查本次匹配是否需要放行
            * @Param: 
            * @return: 
            * @Author: Lei
            * @Date: 
     */
    
    public boolean check(String[] urls,String requestURI){
        for (String url : urls) {
            boolean match=PATH_MATCHER.match(url,requestURI);
            if(match){
                return true;
            }
        }
        return false;
    }
}
